JPS629847Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for observing left and right fundus images simultaneously side by side.

It is easy to judge the state of healing after eyeball surgery by using the eye on the non-surgical side as a standard and comparing it with that eye. Additionally, some types of amblyopia often use their left and right eyes alternately, and even in these cases, it is necessary to compare and observe both eyes. Become. However, until now, there has been no suitable testing device that allows both eyes to be observed while being contrasted.

The purpose of this invention is to facilitate the judgment of the state of healing after surgery or to assist in the diagnosis of amblyopia and strabismus by observing the fundus of both eyes side by side.

This invention will be explained below with reference to illustrated embodiments.

1R and 1L are eyeballs, and 2R and 2L are infrared television cameras placed facing these eyeballs. The infrared television cameras 2R and 2L are operated synchronously by a synchronization signal source 3, and the video signals are transmitted through fixed contacts a of interlocking switches 4R and 4L.
are supplied to the monitor receivers 5R and 5L, respectively,
An infrared image of the fundus is displayed.

The video signals from the infrared television cameras 2R and 2L are further introduced into the recording device 7 via gates 6R and 6L, respectively. The vertical synchronizing signal from the synchronizing signal source 3 is applied to a flip-flop 8, and the above-mentioned gates 6R and 6L are opened alternately for each field by the flip-flop 8.

The playback signal of the recording device 7 is transmitted through gates 9R and 9L.
are alternately distributed for each field and written to the memories 10R and 10L, respectively, and the passing signals of the gates 9R and 9L and the memories 10R and 10
The L readout signal is sent to the monitor receiver 5R via the fixed contacts b of the interlocking switches 4R and 4L, respectively.
and 5L.

11R and 11L are changeover switches provided at the control terminals of gates 9R and 9L, 12R and 12L are changeover switches provided at the write terminals W of memories 10R and 10L, respectively, and 13R and 13L are changeover switches provided at the read terminals R of memories 10R and 10L. Each of the provided changeover switches has fixed contacts a and b, and all of them are switched in conjunction with each other. A synchronization signal is extracted from the reproduction output of the recording device 7 by the synchronization separator 14, and the flip-flop 15 is switched by this synchronization signal. One output D of the flip-flop is connected to each fixed contact a of switches 11R, 12R, and 13L, and the other output is connected to each fixed contact a of switches 11R, 12R, and 13L.
It is supplied to each fixed contact a of 12L and 13R. Further, the output signal of the read signal source 16 is transmitted to the switch 13R.
and each fixed contact b of switches 11R, 11L, 12R, 12L.
is grounded.

Next, the operation of the above-mentioned apparatus will be explained with reference to FIG.

When the interlocking changeover switches 4R and 4L are turned to the a side, the infrared television cameras 2R and 2L generate video signals B and C, respectively, under the control of the synchronization signal A from the synchronization signal source 3, and these video signals are Displayed on monitor receivers 5R and 5L. On the other hand, the synchronization signal A is sent to the flip-flop 8.
are supplied to produce square wave outputs D and which control gates 6R and 6L, respectively. Since the rectangular wave outputs D and D appear alternately for one field period, the video signals B and C are alternately recorded one field at a time as shown in E and F, respectively, on the recording device 7 in the form shown in G. .

To display the recorded content on the monitor receivers 5R and 5L, use the interlocking changeover switches 4R and 4L.
Convert to the b side, and switch the interlocking changeover switches 11R, 11.
L, 12R, 12L and 13R, 13L are placed on the a side, and the recording device 7 is used for playback. Then,
The synchronization signal in the reproduced signal G is extracted by the synchronization separator 14, which operates the flip-flop 15 to produce a rectangular wave output D and gate 9R.
and 9L distributes the reproduced signal G into E and F. The distributed reproduction signals E and F are supplied to the monitor receiver 5R and memory 10R and the monitor receiver 5L and memory 10L, respectively.

The memory 10R performs writing with the rectangular wave output D and performs reading with the rectangular wave output, and the memory 10L performs writing with the rectangular wave output and performs reading with the rectangular wave output D. Therefore, while the rectangular wave output D exists, the reproduced signal E that has passed through the gate 9R is output to the monitor receiver 5R.
is simultaneously written to the memory 10R,
On the other hand, the read signal J of the memory 10L is supplied to the monitor receiver 5L. Further, while the rectangular wave output exists, the read signal H of the memory 10R is supplied to the monitor receiver 5R, and on the other hand, the reproduction signal F that has passed through the gate 9L is supplied to the monitor receiver 5L, and at the same time, the read signal H of the memory 10R is supplied to the monitor receiver 5R. written to. As a result, in the monitor receiver 5R, as shown as K, the reproduced signal E that has passed through the gate 9R and the memory 1
The readout signal H of 0R is alternately supplied for each field, and in the monitor receiver 5L, as shown by M, the playback signal F that has passed through the gate 9L and the readout signal J of the memory 10L are supplied for one field. Since the images are alternately supplied each time, an image without flickering can be displayed.

If you want to display a still image, use the recording device 7.
It is sufficient to stop the movement of the tape at and reproduce the still image signal. As a means to obtain a still image in place of this, interlocking changeover switches 11R, 11L, 12
It is sufficient to switch R, 12L, 13R, and 13L all at once to the b side. Then, since the gates 9R and 9L are continuously grounded and cut off, the playback signals E and F of the recording device 7 no longer flow into the monitor receivers 5R and 5L through them, but instead of flowing into the memory 10.
From R and 10L, the signals written just before switching are continuously read out and sent to the monitor receiver 5R.
and 5L, respectively, and a flicker-free still image is displayed.

In the above-described embodiment, the left and right video signals are recorded one field at a time by the recording device, and are played back and displayed on each monitor receiver, so that a display image that sufficiently follows the rapid movement of the eyeballs can be obtained. On the other hand, there are some difficulties in the resolution of displayed images. In order to improve the resolution, frequency dividing circuits 17 and 18 may be placed on the input sides of flip-flops 8 and 15, respectively, to double the period of the synchronizing signal input to flip-flops 8 and 15. Then, gate 6
Since the opening/closing cycle of R, 6L and 9R, 9L and the alternating cycle of writing and reading of memories 10R, 10L are both doubled, recording is performed alternately one image at a time, and each monitor receiver Display will occur at a rate of 15 images per second.

As described above, this invention enables simultaneous observation of both eyes using two monitor receivers, subsequent observation by recording, and observation of still images.
In particular, it greatly contributes to the comparative diagnosis of the left and right eyeballs and the diagnosis of the coordination status of binocular movements.

[Brief explanation of the drawing]

Figure 1 is a block diagram of an embodiment of this invention, Figure 2 is a block diagram of an embodiment of this invention.
The figure is an electrical signal waveform diagram of each part. 1R and 1L... eyes, 2R and 2L... television camera, 5R and 5L... monitor receiver, 6R and 6L... gate, 7... recording device, 9R and 9
L...gate, 10R and 10L...memory.

Claims (1)

[Scope of utility model registration request] A television camera facing each eye,
A gate that alternately extracts the video signals of the left and right eyes from these television cameras for each field or image, a common recording device that records the extracted video signals, and a signal reproduced from this recording device as described above. A gate that distributes left-eye signals and right-eye signals in response to the operation of the gate, memories for the left eye and right eye that store the distributed playback signals, respectively, and memories for the left eye and right eye. A binocular simultaneous examination device comprising monitor receivers which are respectively provided and alternately display the distributed reproduction signal and the readout signal from the memory, or display only the readout signal from the memory.